Monolithic Power Systems Inc. MP6606GF-P

Overview

MP6606GF-P from Monolithic Power Systems is an 8-channel low-side driver IC with serial SPI interface and fault reporting, designed to drive unipolar stepper motor windings and solenoid coils. It operates from 4.5V to 60V input, delivers up to 750mA per channel (single FET on), integrates 700mΩ R_DS(ON) MOSFETs and clamp diodes, and features over-current protection, thermal shutdown, and UVLO.

For engineers reviewing the MP6606GF-P datasheet, MP6606GF-P pinout, MP6606GF-P application, or MP6606GF-P equivalent, key selection criteria include its 60V clamp voltage capability, TSSOP-20EP thermally enhanced package, open-drain nFAULT/SDO outputs requiring external pull-ups, and latch-controlled serial data transfer for multi-device daisy chaining.

Technical Context

The MP6606GF-P implements eight independent N-channel low-side power switches with integrated body diodes and a shared VCLAMP pin for inductive energy clamping. Its serial interface uses SPI-compatible signals (SDI, SCK, nSCS, LATCH) with Schmitt-trigger inputs supporting 3.3V/5V logic levels and up to 10MHz clock frequency.

Internal protection includes cycle-by-cycle over-current detection (trip threshold 0.9–2.1A, 3.5µs deglitch), thermal shutdown at 168°C with 30°C hysteresis, and UVLO activation below 3.2–4V. Fault status is reported via open-drain nFAULT, which asserts low on OCP, OTP, or UVLO events.

Key Specifications

Pinout & Package

The MP6606GF-P is housed in a thermally enhanced TSSOP-20EP package with an exposed pad for improved heat dissipation. The 20-pin layout supports compact motor driver PCB designs while maintaining electrical isolation between high-voltage outputs and logic signals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-side driver applications.

Compared with TB9051FTG and TPIC2810, the MP6606GF-P uniquely balances 60V operation, SPI daisy-chaining, and thermal robustness in a cost-effective TSSOP package - making it optimal for industrial motion control where voltage headroom and board space are critical.

Availability

MP6606GF-P is available at Aetrix Electronics and suitable for unipolar stepper motor drives, solenoid actuation systems, industrial PLC output modules, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP6606GF-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, including DC/DC converters, motor drivers, and LED drivers, with global manufacturing and quality certifications.

The MP6606 product line targets industrial and automation applications requiring robust, high-voltage, multi-channel low-side switching with integrated protection and serial configurability - addressing the need for compact, reliable replacements for electromechanical relays.

FAQ

What is the maximum continuous output current per channel for MP6606GF-P?

The MP6606GF-P supports 750mA continuous output current per channel when only one low-side MOSFET is active, assuming adequate PCB thermal design (e.g., 2oz copper, thermal vias under exposed pad). When all eight channels operate simultaneously, the maximum recommended current drops to 500mA total due to junction temperature limits and θ_JA = 40°C/W.

How should the VCLAMP pin be connected for optimal inductive load protection?

VCLAMP must be connected either directly to VIN (for basic clamping at VIN + ~1.1V) or to a TVS diode whose breakdown voltage is selected to keep VCLAMP ≤60V. For 24V systems, a 24V TVS is typical; for higher VIN, select a TVS with breakdown voltage ≤60V minus forward drop. Never leave VCLAMP floating - it must be tied to a defined voltage node.

Does MP6606GF-P require an external logic supply voltage?

No. The MP6606GF-P derives all internal logic and gate drive voltages from the main VIN supply (4.5V–60V). Its Schmitt-trigger logic inputs accept 3.3V or 5V signals directly without level shifting, and no auxiliary VCC rail is needed - simplifying system power architecture.

What happens to the outputs during an over-current fault event?

When over-current protection triggers (exceeding 0.9–2.1A for >3.5µs), all eight output MOSFETs are immediately disabled, and the open-drain nFAULT pin is pulled low. After a 2.5ms auto-retry interval, the device attempts to re-enable outputs. If the fault persists, nFAULT remains low and repeated retries occur until the condition clears.

Can multiple MP6606GF-P devices be controlled using a single SPI bus?

Yes. The SDO pin functions as a daisy-chain output: data shifted into the first device exits SDO and feeds SDI of the next. With nSCS shared and LATCH synchronized, up to N devices can be configured with one 8×N-bit SPI transaction, reducing MCU pin count and simplifying firmware for multi-axis motor control.

Is thermal derating required when operating above 85°C ambient?

Yes. The datasheet specifies R_DS(ON) increases to 1200mΩ at TJ = 85°C, raising conduction loss. At TA = 105°C, maximum allowable power dissipation falls to ~1.3W (using PD_MAX = (150°C − TA)/θ_JA). Derate output current accordingly - e.g., 750mA is only guaranteed at TA ≤ 25°C with optimal layout.

What is the purpose of the LATCH pin, and how is it used in timing-critical applications?

LATCH captures the contents of the internal 8-bit shift register and applies them simultaneously to all eight outputs. This eliminates skew between channel activations. In timing-critical applications like stepper microstepping, LATCH is asserted after full 8-bit data transfer to ensure synchronized phase transitions across all windings.